âº to âpay âmoney in âorder to set someone âfree: Her âfather ransomed her for a million âdollars. (Definition of ransom from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press).ansom verb [T]. âº to âfree someone who has been taken away by âpaying âmoney: The âexecutive was ransomed for a million âdollars. (Definition of ransom from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
Convergent boundaries are plate boundaries formed when two tectonic plates crush together. The denser of the two plates goes under the other! For example, if two oceanic plates (which are tectonic plates found in the ocean) collide, the denser of the two plates goes under the other and forms an oceanic trench. If an oceanic plate and a continental plate collide (a continental plate is a tectonic plate that holds land/continents), the oceanic plate will go under the continental plate and goes into the mantle. If two continental plates collide, the crust thickens and is forced to create landforms such as mountains.
If one of the colliding plates is topped with oceanic crust, it is forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into new crust. Magma formed from melting plates solidifies into granite, a light colored, low-density rock that makes up the continents. Thus at convergent boundaries, continental crust, made of granite, is created, and oceanic crust is destroyed. Two plates sliding past each other forms a transform plate boundary. Natural or human-made structures that cross a transform boundary are offsetâsplit into pieces and carried in opposite directions.